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From: Igal Sapir <[email protected]>
To: pgsql-general <[email protected]>
Subject: Passing a dynamic interval to generate_series()
Date: Sun, 30 Jun 2024 15:39:26 -0700
Message-ID: <CA+zig0-suhFUeS7xcJyZ=4HDFXJ3Kn2adXo3B4zHUzDFgMscCw@mail.gmail.com> (raw)

Hello,

I am trying to pass a dynamic interval to generate_series() with date range.

This works as expected, and generates a series with an interval of 1 month:

SELECT generate_series(
    date_trunc('month', current_date),
    date_trunc('month', current_date + interval '7 month'),
    interval '1 month'
)


This works as expected and returns an interval of 1 month:

SELECT ('1 ' || 'month')::interval;


But this throws an error (SQL Error [42601]: ERROR: syntax error at or near
"'1 '"):

SELECT generate_series(
    date_trunc('month', current_date),
    date_trunc('month', current_date + interval '7 month'),
    interval ('1 ' || 'month')::interval
)


And this returns a series with interval of 1 second??

SELECT generate_series(
    date_trunc('month', current_date),
    date_trunc('month', current_date + interval '7 month'),
    (interval '1 ' || 'month')::interval
)

Because this returns an interval of 1 second:

SELECT (interval '1 ' || 'month')::interval;

Is that a bug?


I am able to work around the issue using a CASE statement, but shouldn't it
work simply by concatenating the string with the || operator?

Thank you,

Igal

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